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site hacked google warnings too...pls help

I wouldn't have noticed that my site was hacked if Google didn't sent me an email letting me know that he found some hidden keywords in my pages and it breaks their rules and some pages were taken of the index.
I took a look at my FTP and in that particular domain indeed there were some extra files like this:

1. a folder named .xdata which contained at least 300 html files with weird names like: 790-sports-animal.com.html; 2010-heisman-odds.html; agua-bella.html and so on. These html files contained urls and keywords
2. a file named Iog.php which contained the following code:

it looks like you didnt clean the server properly. from what you tell, there may be a file, or multiple files left on the server to clean/delete. remember that this kind of issues loves to embed itself to other files and run free that way.

You say you keep changing folder permission, but it keeps changing it back, this may indicate there are still files to clean on your server.